Improvement in angular bit-stocks



"J. w. ANTHOINE. ANGTJLAR BIT-STOCK.

Patented Dec. 21, 1875.

No.171,Z55.

Din/bares.

N- PETERS, FHOTO-LITNOGRAFHER, WASHINGTON, D c- 'UNITED STATES PATENT OFFI E.

JAMES W. ANTHOINE, OF MILLER/S FALLS, MASSACHUSETTS.

IMPROVEMENT IN ANGULAR BIT-STOCKS.

Specification forming part of Letters Patent No. l 7 L255, dated December 31,1875; application filed October 2s, 1875.

To all whom it may concern:

Be it known that I, JAMES W. ANTHOINE, of Millers Falls, in the county of Franklin and State of Massachusetts, have invented a new and useful Improvement in Angular Bit Stocks or Braces and do hereby declare the same to be fully describedin the following specification and represented in the accompanying drawings, of which- Figure l is a top view, Fig. 2 a side elevation, and Fig. 3 a longitudinal section, of an angular bit stock or brace provided with my invention; in the carrying out of which I combine with two furcated bit-shanks, connected by a universal joint, a bifurcated handle (of a form to be grasped by the palm and fingers of a persons hand) and a bifurcated supporter, hinged together at their prongs, and provided with slotted curved arms and a clamp-screw and nut, all being substantially as hereinafter described, and also as represented in the aforesaid drawings, in which- A and B denote two furcated bit shanks, connected by across or universal joint-piece, a, the prongs b b. b b and joint-piece constituting a universal joint. lhese bitshanks, formed as shown, are arranged within and so as to revolve in two bifurcated Supporters, O D, the prongs 0 c of one of such supporters being extended between those of the other, and connected thereto by pivotscrews d d, all as shown. Thus, onesupporter becomes hinged to the other. From these supporters two slotted curved arms, E F, are extended and lapped on each other, they being provided with a clamp-screw, G, to go through their slots, and with a thumb -nut, H, to engage with said screw.

The bit-shank A, where projecting beyond the handle or supporter O, is pyramidal, as shown at e, to enter the socket of a common bit-brace, as the shank of a bit or boring-tool usually does. Furthermore, the shank Bis forked, and on its outer surface is provided with a screw, f, to receive a sleeve, 9, there being placed within the said part B, and between the prongs th'ereof, a pair of jaws, H H, shaped as shown, and provided with a spring, I, for separating them. The sleeve, also shaped as shown, is for closing the jaws or forcing them toward each other, while it may be in the act of being screwed upon the shank B. These jaws are for holding a boring tool or bit by the head ofits shank.

I do not claim, in a bit-stock, to combine porter and their curved arms and clamp-screw, the two connected pairs of prongs c 0, one' pair being projected directly from the handle, and the other from the driven or lower shaftsupporter.

By my invention the article is not only much simpler in construction and rendered less expensive to make, butit can be supported by the left hand of an operator hold ofits-handie, while he operates the bit-brace with his right hand.

As the handle 0 is not only to enable an operative with one hand to steady the article, but to force it forward while in use, such handle, ifconnected with the shaft-supporter D only by the slotted and curved arms E F, and their clamp-screw G and nut H, would be very liable to cause one arm to slip on the other, so as to vary the angular position of the two shafts, and the directions of bore of the bit. I

.By having the lower shaft-supporters and the handle connected by the four pron gs and their pivots, the liability of accidental change of angular position of the shafts under forward pressure of the handle is greatly lessened, if not entirely obviated.

I do not claim an angular bit stock or brace having its shank-supporters not hinged together, except by the universal joint of their shanks, such being as shown in the said patent.

I claim In the described angular bit stock or brace, in combination with the furcated bit-shanks A B, connected by a universal joint, as described, the bifurcated tubular handle (J and shaft-supporter D, hinged together at their prongs, and provided with slotted curved arms, and a clamp-screw and nut therefor, all substantially as set forth.

JAMES W. ANTHOINE. Witnesses:

R. H. EDDY, J. R. Snow. 

